Because they show exactly how much of something is there/needed.
Answer:
y = x + 3
Step-by-step explanation:
the equation ofa line in slope-intercept form is
y = mx + c ( m is the slope and c the y-intercept )
here m = 1 and c = 3, hence
y = x + 3 ← is the equation of the line
Answer:
x=20
Step-by-step explanation:
do the equation 3x+50=6x-10